Dichta Catalogue

3

Rotary shaft seals 5

Frontseal® (V-rings) 25

Compounds 57

Wiper seals 39

Special parts 49

4

THE TRADITION OF HIGHEST QUALITY

DICHTA® designs, produces and distributes shaft seals and other sealing products with highest quality standards using advanced manufacturing techniques and approved quality systems.

Building on 30 years experience, the DICHTA® group has developed to a true world class supplier, serving clients on all continents through offices in Switzerland and Italy, with modern production facilities in Italy and the Far-East.

DICHTA® manufactures products in accordance with the last edition of ISO 9001 system, supplying continuous high quality products with full batch traceability, encoded in a barcode system. In addition, the newly obtained ISO 14001 certification ensures our attention to sustainability and respect for the environment.

Our technical design team can develop and produce bespoke customer solutions with realistic lead times at competitive conditions.

A worldwide distributor network backed by highly qualified personnel, ensures that our customers receive a fast and reliable service to solve even their most demanding requirements.

Moreover, the recently new built Headquarter is hosting a large modern warehouse with a wide range of items which availability is published online and updated every 24 hours.

Rotary shaft seals

5

Description of standard seal types 6

Additional types 7

Technical data 9

Installation and operation 10

Housing bore 12

Lubrication 13

Temperature 14

Pressure 15

Production and Quality assurance 16

Radiaseal® 18

Splitring® 20

Dina seals 21

C64D type 22

Storage and handling / Interchange table 23

Rotary shaft seals

6

Description of standard shaft seal types (in accordance with DIN 3760)

Rubber covered O.D., metal insert, sealing lip with garter springA

Rubber covered O.D., metal insert, sealing lip with garter spring and additional dust lip

AS

B Outer metal case, sealing lip with garter spring

BS Outer metal case, sealing lip with garter spring and additional dust lip

C Outer metal case with reinforcing metal inner ring, sealing lip with garter spring

CS Outer metal case with reinforcing metal inner ring, sealing lip with garter spring and additional dust lip

Rotary shaft seals

7

Additional types

AS - P Reinforced sealing lip for overpressure, with or without additional dust lip

B - O Outer metal case, sealing lip without garter spring

C - O Outer metal case with reinforcing metal inner ring, without garter spring”

C - TE Inner metal case and sealing lip on O.D.; type B-TE available as well

C-DUO Outer metal case with reinforcing cap, twin sealing lips with two garter springs

COMBI SEALCombination of a shaft seal and an additional lip in polyurethane against soiling, all in one housing

Integrated sealing system: oil seal, wear sleeve and dust protection in one unit

RADIASEALRotary shaft seal with fabric reinforced outer diameter. See pag 18

SPLITRINGRotary shaft seal only rubber, split. See pag 20

DINA Seal Metal ODRotary shaft seal for needle bearing applications, without spring. See pag 21

DINA Seal Waved ODRotary shaft seal for needle bearing applications, without spring. See pag 21

C64D Rotary shaft seal for heavy industry. See pag 22

AS - PX Reinforced sealing lip and special metal insert for overpressure, with additional dust lip

A - DUO Twin sealing lips with two garter springs

A - O Sealing lip without garter spring

A - FL Different spring groove for a better spring retention, waved O.D.

A - LD Sealing lip with hydrodynamic ribs, left rotation

A - RD Sealing lip with hydrodynamic ribs, right rotation

A - WD Sealing lip with bi-directional hydrodynamic ribs

ASX7 Waved rubber cove-red O.D., metal insert, sealing lip with garter spring, with or without dust lip

A - EC End covers

Rubber covered I.D. and sealing lip on O.D.

A - TE

CASSETTE SEAL

Rotary shaft seals

8

Additional types

AX-7M This seal is designed for use in presence of pressure, up to max 6 Bar. A metallic band is inserted in the back of the seal. It is assembled in open housings and does not need a retaining plate. This profile is flexible and easy to assemble, ensuring stability in the housing.

AX-3M This seal does not need the retaining plate. The rubber seal has a flexible metal band in its shoulder, which makes it re-sistant, elastic and easy to install. This seal can be assem-bled in open housings and has a better resistance for possible misalignments. The spring is more protected than in standard ones.

AX-3ML Same profile as the AX-3M but this one has a rigid metal insert inside the shoulder, instead of the flexible metal band.

C59D Interchangeable with Garlock® 59 seal, it is mostly used in steel mill plants or wherever a strong seal is necessary. This profile has a flexible rubber sealing lip and a metallic cage back with a finger-spring. The seal withstands a pressure of max 1 Bar.

AX-GL Originally designed to withstand large misalignments of some millimeters in static conditions, this seal can also be used for dymanic sealing with limited radial speed. The profile has a metallic cage inside its shoulder, with a spring that ensures the constant load operation.

C63D Interchangeable with Garlock® 63 seal, it is mostly used in hot steel mill plants. This profile has a flexible rubber sealing lip and a metallic cage back with a finger-spring.

Rotary shaft seals

9

Technical data

Description of rotary shaft seal

Working principle

The area between the sealing edge and the shaft is the most important. The sealing effect is achieved by preloading the sealing lip, making its internal diameter slightly smaller than the shaft diameter. The garter spring ensures constant mechanical pressure and maintains the radial force to the shaft, flattening the sealing edge to defined width. Sealing is provided by the surface tension of the hydrodynamic oil film between the seal flattened area and the shaft. Oil thickness must be between 1 and 3 µm to avoid leakage. The meniscus acts as an interface between the outside air and the fluid. Any break in the meniscus will result in leakage. This can occur if the shaft contains scratches along the seal path.

Metal case

The metal insert or case is used to give strength and rigidity to the seal. Normally it is made of cold rolled steel in accordance with DIN 1624.To avoid rust or chemical attack, stainless steel can be used.Chrome Nickel AISI 304 (DIN 1.4301 - V2A)Chrome Nickel Molybdenum AISI 316 (DIN 1.4401 - V4A)

Garter spring

The garter spring maintains the radial force exerted by the sealing lip around the shaft surface. Normally produced in harmonic spring steel wire SAE 1074 (DIN 17223) or stainless steel wire Chrome Nickel AISI 302/304 (DIN 1.4300).For special applications also stainless steel springs in AISI 316 (DIN 1.4401 - V4a) are available. All our standard shaft seals produced in FPM compound are fitted with stainless steel springs in AISI 302/304.

rubber covered OD

metal insert

dust lip

sealing lip / back face sealing lip / front face

sealing edge

spring groove

garter spring

outside sealing surface

air-side

radial spring pressure

fluid-side

meniscus

Rotary shaft seals

10

Installation and operation

Shaft

The shaft surface finish is of primary importance for efficient sealing and for achieving a useful lifetime. Basically the hardness should increase with increasing peripheral speed. According to DIN 3760 minimum hardness required is 45 HRC. At a peripheral speed of 4 m/s the hardness should be 55 HRC and at 10 m/s 60 HRC. Recommended hardness depth: 0.3 mm if shafts are not fully hardened.

Lubrication is also very important. Surface finish as specified by DIN 3760 must be Ra 0.2 to 0.8 μm, Rz 1 to 5 μm, with RMAX = 6.3 μm. Rougher surfaces generate higher friction, hence higher temperatures. Machining defects and scratches on the shaft must be avoided.

Even very small defects could be sufficient to increase the film thickness, eventually rupturing the meniscus and causing leakage. It is also important to avoid spiral grinding or marks, because they can cause a pumping effect and leakage.

Recommended machining tolerance is ISO h11 according to DIN 3760 (see table below).

Shaft diameter (mm) Tolerance

from

6

10

18

30

50

80

120

180

250

315

to

10

18

30

50

80

120

180

250

315

400

h11

0- 0,090

0- 0,110

0- 0,130

0- 0,160

0- 0,190

0- 0,220

0- 0,250

0- 0,290

0- 0,320

0- 0,360

Shaft eccentricity

Shaft diameter (mm)

Perm

issi

ble

eccen

tric

ity

(mm

)

Shaft run out

Shaft speed (RPM)

Shaft

run o

ut

(mm

)

Rotary shaft seals

11


The best working condition is to have a shaft rotating perfectly centered and concentric to the axis of the rotary shaft seal. Obviously this is not possible and inevitably some shaft run out is always present. Therefore the sealing lip must compensate for it. The higher the rotation speed is, the smaller can be the permissible shaft run out which can be compensated by the sealing lip, because the inertia of the sealing lip prevents it from following the shaft movements. It is therefore advisable to install the seal immediately adjacent to the bearing and minimize bearing play.

Eccentricity between shaft and housing bore centers must be avoided as much as possible so as to reduce unilateral load (wear) of the sealing lip.

Rotary shaft seals

12

Housing bore

A good press fit of the shaft seal onto the housing bore is vital. The result is a stable installation.

Recommended machining tolerances of the housing bore diameter for rotary shaft seals are H8 according to DIN 3760 (see table below).

The maximum surface roughness of the housing according to DIN 3760 is: Ra 1.6 to 6.3 μm, Rz 10 to 20 μm, with RMAX = 25 μm.We recommend the use of a shoulder or a spacer ring against which the seal can be located. Should this not be possible one has to pay special attention that the seal is installed perpendicularly to the shaft axis.To ease installation the entrance of the groove should have a chamfer inclined by 10° - 20° and a depth according to the ring thickness (see figure below). Also the mounting end of the shaft should have a chamfer inclined by 15° - 30°, with rounded and polished edge.

ToleranceHousing bore (mm)

from

10

18

30

50

80

to

18

30

50

80

120

h8

+ 0,027 0

+ 0,033 0

+ 0,039 0

+ 0,046 0

+ 0,054 0

ToleranceHousing bore (mm)

from

120

180

250

315

400

to

180

250

315

400

500

h8

+ 0,063 0

+ 0,072 0

+ 0,084 0

+ 0,089 0

+ 0,097 0

D H

8

15° ÷ 30°

5° ÷ 10°

1 ÷ 1.5 mm

Rotary shaft seals

13

Lubrication

Lubrication is very important for good functioning and lifetime of the seal. The sealing lip does not actually run on the shaft directly, but on an oil film, called meniscus. The thickness of the meniscus is usually between 1 - 3 μm, but is influenced by many factors such as oil viscosity, shaft surface finish and seal radial load.

The first few hours of operation is called the «bedding-in» time. This is necessary not only for the meniscus to form, but also for the sealing edge to flatten. During this time limited leakage is possible.

Adequate lubrication strongly reduces friction between sealing lip and shaft and also acts as a coolant to the generated heat. The lower the temperature can be kept, the longer will be the life expectancy of the seal. Should the fluid have poor lubricating capability (water and aqueous solutions), dust lip-type (AS, BS or CS) rotary lip seals must be used. In such a case make sure to fill the space between the two lips with grease. The friction heat also depends on the peripheral speed of the shaft.

Friction not only can be detrimental to the lip material, but also can cause a power loss which could be quite significant if low power is transmitted.

Sealing lip frictional heat

Shaft diameter in mm

exc

ess

tem

pera

ture

°C

Frictional power loss

Peripheral Speed m/s

Watt

Rotary shaft seals

14

Temperature

The temperature on the sealing lip is the medium temperature increased by the temperature caused by frictional heat.The higher the effective operating temperature is, the faster the ageing of the elastomer will be, thus affecting the performance of the sealing lip and the shaft.Frictional heat depends on seal design and material, peripheral speed, sealing lip preloading spring force, shaft design and surface finish, lubrication, medium, etc.

Permissible speeds in pressure-free state to DIN 3760

Shaft diameter

rpm

Perm

ess

ible

speed

Rotary shaft seals

15

Pressure

In most applications there is no or little differential pressure. Where the rotary shaft seal is exposed to pressure, however, the sealing lip is pressed against the shaft, thus increasing temperature. In some cases the pressure can even cause overturning of the sealing lip.

Over 0,2 bar at higher peripheral speeds or over 0,5 bar at low peripheral speeds back up rings or special designed rotary shaft seals with stronger sealing lip and supporting metal insert must be used. For the latter we refer to our P-types (e.g. AS-P). Nevertheless permissible overpressures with P-type shaft seals are limited (see diagram below).

On request we can supply shaft seals with special reinforced lip to withstand pressure over the indicated value.

If back up rings are installed standard rotary shaft seals can be used. However, back up rings increase costs and often the necessary space for installation is not available. Sometimes the use of back up rings is even not possible, since it requires a very accurate fitting as well as very low eccentricity of the shaft.

Specially designed rotary shaft seals (P-types) are therefore preferred, even if more accurate fitting and lower eccentricity of the shaft than in normal cases is required.

Rotary shaft seals AS-P. Permissible Overpressure

Rotary shaft seals

16

Production and Quality assurance

Our rotary shaft seals are manufactured according to German Standards DIN 3760 and Quality Assurance Standards ISO 9001.

All production phases are checked and all measurements are recorded and stored for traceability.

In accordance with German Standards DIN 3760

1) The average value for d2 taken from a number of measurements shall not be greater than the value specified for d2 plus the interference allowance.

2) The tolerance on d2 (i.e. d2max - d2min) is to be determined by taking three or more measurements equally spaced around the circumference.

Interference allowance and permissible eccentricity

Seal outer diameter d2

(mm)

Interference allowance (1)

Types A, AS Types B, BS, C, CS

Tolerance on d2 (2)

Types A, AS, B, BS, C, CS

up to 50

over 50 to 80

over 80 to 120

over 120 to 180

over 180 to 300

over 300 to 500

0,25

0,35

0,50

0,65

0,80

1,00

+0,30 +0,20+0,15 +0,10

+0,35 +0,23+0,20 +0,13

+0,35 +0,25+0,20 +0,15

+0,45 +0,28+0,25 +0,18

+0,45 +0,30+0,25 +0,20

+0,55 +0,35+0,30 +0,23

A AS B BS C CS

Rotary shaft seals

17


Final inspection standard

In accordance with our Production standards and DIN 3761 Part 4.

The contact band width of the sealing lip is defined, according to DIN 3761 part 4, as follows:

Shaft diameter(mm)

Front band width(mm)

Back band width(mm)

up to 50

50 to 120

over 120

1,2

1,5

2

0,5

0,8

1

Zone Not permitted Permitted

Contact band

1 = Front side

2 = Back side

Well of seal

Seal O.D.

Chamfer

Spring retention lip

Inside wall

1+2

3

4

5

6

7

Breaks in Sealing Edge

Bond failures

Fault which will affect

the sealing on O.D.

Faults which will affect

the installation of the seal

Shortcomings could

cause break

Free burrs

No fault permitted

Minor faults provided that

at least 2/3 of the O.D. is

unbroken at this point

Small shortages

Burrs permitted if bonded

or secured to the inside wall

4

5

7

3

6

12

4

5

3

6

12

7

Rotary shaft seals

18

Types for special applications

Radiaseal®

Radialseal® is a rotary shaft seal with fabric reinforced outer diameter, rubber sealing lip and fitted with garter spring.

Radiaseal@ has been designed for use as bearing seal for roll neck application of metal rolling mills, paper mills, heavy duty gear-boxes and for marine applications.

Radiaseal@ has several advantages:

- Accurate machining of housing bore is not essential.- Easy assembly.- No corrosion problems.- Easy replacement.

There are 4 different types of Radiaseal® in both endless or split version.

Standard Radialseal® are produced in NBR elastomer with 3% PTFE. Upon request it is also available in FPM, HNBR, EPDM, SIL, and with stainless spring AISI 302 (DIN 1.4300).

D5 Standard profile

D5S With additional dust lip

D6 With ports in the base, usually twin fitted back to back. An anular groove in the housing allows lubricant to pass around to the sealing lips

D7 With anular groove in addition to ports, allowing lubricant to pass around to the sealing lipsUsually twin fitted back to back

D5 PTFE

Radiaseals® with PTFE covered sealing lip

D5P This seal is designed for use in presence of pressure, up to max 6 Bar. The radial force on the shaft caused by the fluid in pressure is reduced, and as a consequence there is a reduc-tion of temperature. The absence of external metal avoids the possibility to damage the seal housing. This type of seal needs a retaining plate

DXVT Produced with a high resistance rubberised fabric back, it al-lows a higher ring stiffness compared to normal seals. As an alternative solution to avoid shavings pollution in case of un-derdimensioned or reduced metallic parts

L

D H

8

d h

9

H

Rotary shaft seals

19


Shaft tolerance ISO h9.Surface finish roughness Rz 4 micron.Hardness of the shaft surface 55 HRC or more.

Housing bore tolerance ISO H8.Surface finish roughness Rz 16 micron.

Radiaseal® is manufactured with oversized O.D. and the housing must be provided with retaining plate to give controlled axial compression to the seal, to correctly locate the seal in the housing, ensuring a good sealing on the O.D.

When fitting a split Radiaseal® to horizontal shafts, it should always be fitted with the split at the highest point of the shaft (i.e. remote from the oil).Where two split Radiaseals® are fitted together, the splits should be staggered at 30° on each side of the top.

The bore entrance and the shaft should be provided with lead-in chamfer to facilitate proper entrance of the seal into the cavity and to avoid lip damage. Length and angle of the chamfers should be according to drawing and table below.

d = nominal shaft diameterD = nominal bore diameterH = shaft seal heightL = nominal bore depth

Installation instructions30°

15°

a

b

Dd

B

L

Rotary shaft seals

20


Splitring®

Splitring® is a rotary shaft seal made of only rubber, split, fitted with stainless steel coil garter spring AISI 302 (DIN 1.4300).

Splitring® is used where a standard integral hard shaft seal cannot be fitted due to the presence of flanges or supports.

Splitring® can be also used to avoid high down time costs.

They are produced in standard elastomer NBR.Other elastomers available upon request.

Installation instructions

Shaft tolerance ISO h9, surface finish max. roughness Rz 4 µm, hardness of the shaft sealing surface 55 HRC or more.

Housing bore according to table:

Splitring® should be fitted with the split at the highest point of the shaft and should not be used where static fluid level is higher than the lowest point of the seal.

Clean the housing recess and remove all burrs and sharp edges. Stretch the coil garter spring around the shaft and join it by screwing the conical end into the other and place the Splitring® around the shaft and stretch the spring into the groove on the sealing lip. Tight the Splitring® slightly against the shaft by pressing its outside diameter and insert the seal into the housing bore starting near to the split and working around the entire periphery until the Splitring® has been entered into the housing. Then push the seal fully home. The housing must be provided with retaining plate to give axial compression to the seal.

Shaft diameter(mm)

Bore diameter D tolerance(mm)

Bore diameter L tolerance(mm)

Up to 140

Over 140 up to 200

Over 200 up to 300

Over 300 up to 450

Over 450

± 0,05

± 0,07

± 0,10

± 0,12

± 0,15

± 0,12

± 0,15

± 0,15

± 0,20

± 0,20

Rotary shaft seals

21


DINA Seals

This is a specially designed rotary shaft seal to be used for needle bearing applications.DINA Seal is reinforced with steel insert and has a single thin lip without spring that, together with minimal interference, has low frictional loss.In order to fit better into the bore, DINA Seal has a wavy rubber outer diameter. DINA Seal can also be supplied with metal O.D.

Standard DINA Seal materials are NBR elastomer and Carbon Steel insert.For special applications FPM and SIL elastomers and/or stainless steel insert are available upon request.

DINA Seal can be used to prevent lubricant leakage if mounted with the front face near to the needle bearing, or to protect the bearing from dust and dirt if mounted with the back face near to it.

O.D

.

Rotary shaft seals

22


C64D Seals Seal construction

This seal is interchangeable with Garlock® 64 seal.

C64D shaft seal has been developed specifically for severe operating conditions in heavy industry. The performance and life of the seal in these conditions, involving important axial tolerances (shaft tolerances, shaft run out, non eccentricity and bearings clearance), are largely dependant upon the preload of the seal lip on the shaft.

C64D shaft seal has a very flexible sealing lip with a finger spring/garter spring combination that compensates shaft deviations without the need of changing the lip preload.

1. Garter spring Material: AISI 302 To provide a regulated loading on

the sealing lip and enable the sealing element to follow shaft deflections.

2. Sealing lip Compound: FPM, NBR, SIL

3. Stainless steel spring carrier Material: ACX 260 AISI 316L 2D Designed to ensure the spring

retention during the assembly. If necessary to permit the removal and refitting of garter spring to provide a predetermined sealing lip preload which will permit the sealing element to follow shaft deflections.

4. Steel filler ring Material: Fe 37 To provide the rigidity required and to

ensure an accurate assembly of the seal in the groove.

5. Steel outer ring Material: Fe-P04

FPM SIL NBR

-20 / +120

75

≤ 25

-60 / +120

70

≤ 25

-20 / +220

75

≤ 35

Temperature [°C]

hardness [°ShA]

Max operating speed [m/s]

Rotary shaft seals

23

Storage and handling

Some storage precautions must be taken in order to avoid deterioration of the material. Rotary shaft seals should be stored in a dust free and dry atmosphere and they must be kept in their original wrapping which should only be opened just before installation. Samples sholud be repacked after inspection. Excessive humidity will deteriorate some elastomers as well as cause corrosive damage to metal casing and spring.Do not drop rotary shaft seals on shelves or boxes, nor hang seals on hooks, wires or nails,since in either case the sealing lip can be damaged. Seals should be stored in a horizontal position.Seals should be used on a first-in first-out basis to avoid ageing on the shelf. Avoid storage near sources of heat or near electrical equipments that may generate ozone. Also keep away from direct sunlight.

Shaft seals interchange table

Dichta types A AS AS-P A-O A-DUO B BS C CS

BA

827N

DG

A

CB

A

R21

IE

hMS4

35

SC

WA

G

BASL

827S

DGS

ASL

CC

FA

R23

IEL

hMSA7

32

TC

WAS

GP

BABSL

827SK

DGSP

CF

TCN

WASY

GAP

BAOF

827NO

DE

AOF

CD

SA

R26

IO

VC

WAO

GSM

BADUO

827D

DGD

ADUO

CK

DUPLEX

R22

IELR

DC

WAD

G2

B1

822N

DF

B

BB

ABI

R4

EE

CRW1

48

SB

WB

L1

B1SL

822S

DFS

BSL

BC

R6

EEL

CRWA1

47

TB

WBS

L1P

B2

824N

DFK

C

DB

R1

EEP

CRWh1

45

SA

WC

L2

B2SL

824S

DFSK

CSL

DC

CRWhA1

41

TA

WCS

L2P

Simrit-Freudenberg

Goetze

Kako

Simmerwerke

Stefa

Gaco

Pioneer Weston

Paulstra

Chicago Rawhide

National

NOK

Dichtomatik

FP

25

Frontseal®Rubber V-Rings for axial dynamic sealing

Description / Standard seal types 26

Installation and operation 27

Clamping bands & clips 29

Production and Quality assurance / Storage and handling 30

Standard sizes 31

Frontseal®

26

Description

The Frontseal® is an all elastomer axial seal for rotary shafts and bearings. It rotates with the shaft and seals axially against a stationary counterface perpendicular to the shaft. This type of seal has been used widely for several applications and has proved to be reliable and effective against dust, dirt, water and oil splash and other media.

The ring consists of three parts:

a) The seal body, installed with interference to the shaft.b) The hinge, acting as a sprung connection between the body and the lip.c) The conical and flexible sealing lip which provides the actual dynamic sealing against the

counterface.

The counterface can be the side wall of the bearing, a washer or any housing.

Standard seal types

The Frontseal® is manufactured in four standard profiles:

Other types, modifications or larger diameters available upon request.

VA It’s the most common profile. It has a perpendicular rear face. Wide range of sizes, from 3 to over 2000 mm shafts.

VS Wide body to ensure higher radial force than VA type. Range of sizes from 5 to 199 mm shafts.

VL This seal is intended for applications where available space is nar-row. Range of sizes from 110 to over 1200 mm shafts.

VRME This heavy-duty profile is also designed primarily for protecting high speed bearing arrangements in rolling mills, papermaking and large machine applications. A clamping band can be used to improve axial fixation. Size list available on request.

VAX Heavy-duty Frontseal®, designed primarily for large high speed bearing arrangements, used for instance in rolling mills and paper-making machine applications. Additionally they can be used as se-condary seals for heavy-duty applications where the primary seal has to be protected against water and/or particular contamination. Range of sizes from 200 to over 2000 mm shafts.

VE It’s a heavy-duty large diameter seal, used for instance in steel milIs, paper milIs and rolling milIs as a dirt/water excluder seal. A clamping band can be used to improve axial fixation. Range of sizes from 300 to over 2000 mm shafts.

VLX This seal is more compact than VL type, commonly used in confi-ned spaces. Size list available on request.

a

b

c

a

b

c

Frontseal®

27


Fitting

Fitting a Frontseal® is very simple. The ring must be slightly stretched and pushed along the shaft. It can either be done manually or with a simple tool, in a way that the distance to the counterface can be maintained constant over the circumference using little pressure. The lip of the Frontseal® should be lubricated with a thin film of grease or silicone oil. In case where friction must be reduced, coat the counterface with a low friction agent and do not apply grease to the lip. The shaft should be preferably dry and free from oil and grease.

Frontseal® not preloaded

oval and/or eccentrically turning shaft

Frontseal® fitted with preloading using a tool

tilted counterface

Eccentricity / Misalignment

The V-shape of the Frontseal® provides an effective and reliable sealing even with oval section, shaft run-out, eccentricity or shaft misalignment. Sealing is not even affected by a slightly tilted counterface (maximum permissible flatness deviation is usually defined as 0.4 mm per 100 mm).

H1H

Frontseal®

28


Counterface

The type of counterface finish is very important for an efficient sealing and for useful life of the seal. The surface must be smooth, free of scratches and sharp peaks. The choice of surface finish depends on the medium to be sealed and on the shaft speed. The choice of counterfaces material is highly dependant on the medium too. For normal operating conditions, conventional mild steel of min 125 HB is sufficient. With an increase in speed and the presence of abrasive particles, the hardness of the counterface must also be increased. Surface treatment is suggested for water splash or other corrosive media.

Peripheral speed

Due to the influence of the centrifugal force, the contact pressure of the lip decreases with increased speed.At peripheral speed up to 8 m/s the lip of the Frontseal® has a good pressure against the counterface and it has the function of a light contact seal.Over 8 m/s the seal must be axially supported and above 12 m/s radial retention is necessary, mounting the Frontseal® in an axial groove or applying an adequate support.

Frontseal®

29

Clamping bands & clips for Frontseal®

Type-VE in AISI430

When the Frontseal® is fitted on the shaft, the body of the ring is subject to a centrifugal force and can move from the shaft. For this reason the Frontseal® requires radial retention that can be supported by a clamping band.

Short description of technical features

The multi-range clamping bands are ideal for use in many different applications with a high mechanical load. With its tensile strength and the even tension force distribution it sets standards for reliable clamping. The clamping band perfectly fits on the VE Frontseal® and ensures an optimal tightness.

The clamping band has a width of 12 mm and a thickness of 0.8 mm, perfectly fitting into the grove of DICHTA Frontseal® Type VE which is 13 mm on all diameters. Both the clamping band and its clip are delivered in stainless steel AISI 430 material. Corrosion resistance in salt spray testing: min. 200 h.

Clamping bands for Frontseals® type VA are also available

Frontseal®

30



Our Frontseal® is manufactured according to Quality Assurance Standards ISO 9001. All production phases are checked and all measurements are recorded and stored for tracing.

Our Frontseal® is individually inspected to ensure that sealing edge and sealing band are free from faults. Also small cracks and shortcomings which could cause a split during installation or operation of the seal are not accepted.

Some storage precautions must be taken in order to avoid deterioration of the material. Frontseal® should be stored in a dust free and dry atmosphere and they must be kept in their original packaging which should only be opened just before installation. Samples should be repacked after inspection.Do not drop Frontseal® on shelves or boxes, nor hang seals on hooks, wires or nails, since in either case the seal can be damaged.Seals should be stored on a first-in first-out basis to avoid ageing on the shelf. Avoid storage near sources of heat or near electrical equipment that may generate ozone. Also keep away from direct sunlight.Avoid unnecessary pressure on the lip during storage.

sealing band

sealing edge

d2

C d1

H1

Dd

H

h

Frontseal®

31

Standard sizes

Frontseal® VA

Ref.Shaft diameter Ring dimensions mm Mounting dimensions mm

C d d2 d1 H1D h H

VAVAVAVAVA

34567

2,73,54,55,56,5

-----

3,54,55,56,58

2,53,2456

5,57,289

10

2,12,42,42,42,4

33,73,73,73,7

C + 1C + 1C + 1C + 1C + 1

C +C +C +C +C +

46666

2,53333

±±±±±

0,30,40,40,40,4

VAVAVAVAVA

810121416

89,5

11,513,515,5

-----

9,511,513,515,517,5

79

10,512,514

111516,518,520

2,43,43,43,43,4

3,75,55,55,55,5

C + 1C + 2C + 2C + 2C + 2

C +C +C +C +C +

69999

34,54,54,54,5

±±±±±

0,40,60,60,60,6

VAVAVAVAVA

1820222528

17,519212427

-----

1921242729

1618202225

2226283033

3,44,74,74,74,7

5,57,57,57,57,5

C + 2C + 2C + 2C + 2C + 3

C +C +C +C +C +

912121212

4,56666

±±±±±

0,60,80,80,80,8

VAVAVAVAVA

3032353840

2931333638

-----

3133363843

2729313436

3537394246

4,74,74,74,75,5

7,57,57,57,59

C + 3C + 3C + 3C + 3C + 3

C +C +C +C +C +

1212121215

66667

±±±±±

0,80,80,80,81

VAVAVAVAVA

4550556065

4348535863

-----

4853586368

4045495458

5055596468

5,55,55,55,55,5

99999

C + 3C + 3C + 3C + 3C + 3

C +C +C +C +C +

1515151515

77777

±±±±±

11111

VAVAVAVAVA

7075808590

6873788388

-----

7378838893

6367727681

7579848893

6,86,86,86,86,8

1111111111

C + 4C + 4C + 4C + 4C + 4

C +C +C +C +C +

1818181818

99999

±±±±±

1,21,21,21,21,2

VAVAVAVAVA

95100110120130

9398

105115125

-----

98105115125135

859099

108117

97102113122131

6,86,87,97,97,9

111112,812,812,8

C + 4C + 4C + 4C + 4C + 4

C +C +C +C +C +

1818212121

99

10,510,510,5

±±±±±

1,21,21,51,51,5

VAVAVAVAVA

140150160170180

135145155165175

-----

145155165175185

126135144153162

140149160169178

7,97,9999

12,812,814,514,514,5

C + 4C + 4C + 5C + 5C + 5

C +C +C +C +C +

2121242424

10,510,5121212

±±±±±

1,51,51,81,81,8

VAVA

190199

185195

--

195210

171180

187196

99

14,514,5

C + 5C + 5

C +C +

2424

1212

±±

1,81,8

Frontseal®

32

Standard sizes

Frontseal® VA

Over 2000 mm available on request


C d d2 d1 H1D h H

VAVAVAVAVA

200220250275300

190210235265290

-----

210235265290310

180198225247270

210228255277300

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

±±±±±

44444

VAVAVAVAVA

325350375400450

310335365390430

-----

335365390430480

292315337360405

322345367390435

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

±±±±±

44444

VAVAVAVAVA

500550600650700

480530580630665

-----

530580630665705

450495540600630

480525570630660

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

±±±±±

44444

VAVAVAVAVA

725750800850900

705745785830875

-----

745785830875920

670705745785825

700735775815855

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

±±±±±

44444

VAVAVAVAVA

9501000105011001150

920965

101510651115

-----

9651015106511151165

865910955

10001045

895940985

10301075

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

±±±±±

44444

VAVAVAVAVA

12001250130013501400

11651215127013201370

-----

12151270132013701420

10901135118012251270

11201165121012551300

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

±±±±±

44444

VAVAVAVAVA

14501500155016001650

14201470152015701620

-----

14701520157016201670

13151360140514501495

13451390143514801525

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

±±±±±

44444

VAVAVAVAVA

17001750180018501900

16701720177018201870

-----

17201770182018701920

15401585163016751720

15701615166017051750

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

±±±±±

44444

VAVA

19502000

19201970

--

19702020

17651810

17951840

14,314,3

2525

C + 10C + 10

C +C +

4545

2020

±±

44

d2

C d1

H1

Dd

H

h

Frontseal®

33

Standard sizes

Frontseal® VS


C d d2 d1 H1D h H

VSVSVSVSVS

5678

10

4,55,56,589,5

-----

5,56,589,5

11,5

45679

89

101115

3,93,93,93,95,6

5,25,25,25,27,7

C + 1C + 1C + 1C + 1C + 2

C +C +C +C +C +

66669

4,54,54,54,56,7

±±±±±

0,40,40,40,40,6

VSVSVSVSVS

1214161820

11,513,515,517,519

-----

13,515,517,51921

10,512,5141618

16,518,5202226

5,65,65,65,67,9

7,77,77,77,7

10,5

C + 2C + 2C + 2C + 2C + 2

C +C +C +C +C +

9999

12

6,76,76,76,79

±±±±±

0,60,60,60,60,8

VSVSVSVSVS

2225283032

2124272931

-----

2427293133

2022252729

2830333537

7,97,97,97,97,9

10,510,510,510,510,5

C + 2C + 2C + 3C + 3C + 3

C +C +C +C +C +

1212121212

99999

±±±±±

0,80,80,80,80,8

VSVSVSVSVS

3538404550

3336384348

-----

3638434853

3134364045

3942465055

7,97,99,59,59,5

10,510,5131313

C + 3C + 3C + 3C + 3C + 3

C +C +C +C +C +

1212151515

99

111111

±±±±±

0,80,8111

VSVSVSVSVS

5560657075

5358636873

-----

5863687378

4954586367

5964687579

9,59,59,5

11,311,3

13131315,515,5

C + 3C + 3C + 3C + 4C + 4

C +C +C +C +C +

1515151818

11111113,513,5

±±±±±

1111,21,2

VSVSVSVSVS

80859095

100

7883889398

-----

83889398

105

7276818590

84889397

102

11,311,311,311,311,3

15,515,515,515,515,5

C + 4C + 4C + 4C + 4C + 4

C +C +C +C +C +

1818181818

13,513,513,513,513,5

±±±±±

1,21,21,21,21,2

VSVSVSVSVS

110120130140150

105115125135145

-----

115125135145155

99108117126135

113122131140149

13,113,113,113,113,1

1818181818

C + 4C + 4C + 4C + 4C + 4

C +C +C +C +C +

2121212121

15,515,515,515,515,5

±±±±±

1,51,51,51,51,5

VSVSVSVSVS

160170180190199

155165175185195

-----

165175185195210

144153162171180

160169178187196

1515151515

20,520,520,520,520,5

C + 5C + 5C + 5C + 5C + 5

C +C +C +C +C +

2424242424

1818181818

±±±±±

1,81,81,81,81,8

d2

C d1

H1

d D

h

H

Frontseal®

34

Standard sizes

Frontseal® VL

Reference Shaft diameter d

VL 110 105 - 115 99VL 120 115 - 125 108VL 130 125 - 135 117VLVLVLVLVL

140150160170180

135145155165175

-----

145155165175185

126135144153162

VLVLVLVLVL

190200220250275

185195210233260

-----

195210233260285

171182198225247

VLVLVLVLVL

300325350375400

285310335365385

-----

310335365385410

270292315337360

VLVLVLVL

425450500525

410440475510

----

440475510540

382405450472

VL 550 540 - 565 495VL 575 565 - 585 517VL 600 585 - 625 540VL 650 625 - 675 600VL 700 675 - 710 630VL 725 710 - 740 670VL 750 740 - 775 705VL 800 775 - 825 745VL 850 825 - 875 785VL 900 875 - 925 825VL 950 925 - 975 865VL 1000 975 - 1025 910VL 1050 1025 - 1075 955VLVL

11001150

10751125

--

11251175

10001045

VL 1200 1175 - 1225 1090


d2

C d1

H1

d

H

h

WW

Ring dimensions Assembling dimensionsh = 10,5 h1 = 8 +/- 1,5h = 6,0 d2 max = C + 5W = 6,5 d1 min = C + 20

Frontseal®

35

Standard sizes

Frontseal® VE


VE 300 300 - 305 294VE 305 305 - 310 299VE 310 310 - 315 304VE 315 315 - 320 309VE 320 320 - 325 314VE 325 325 - 330 319VE 330 330 - 335 323VE 335 335 - 340 328VE 340 340 - 345 333VE 345 345 - 350 338VE 350 350 - 355 343VE 355 355 - 360 347VE 360 360 - 365 352VE 365 365 - 370 357VE 370 370 - 375 362VE 375 375 - 380 367VE 380 380 - 385 371VE 385 385 - 390 376VE 390 390 - 395 381VE 395 395 - 400 386VE 400 400 - 405 391VE 405 405 - 410 396VE 410 410 - 415 401VE 415 415 - 420 405VE 420 420 - 425 410VE 425 425 - 430 415VE 430 430 - 435 420VE 435 435 - 440 425VE 440 440 - 445 429VE 445 445 - 450 434VEVEVEVEVE

450455460465470

450455460465470

-----

455460465470475

439444448453458

VEVEVEVEVE

475480485490495

475480485490495

-----

480485490495500

463468473478483

VEVEVEVEVE

500505510515520

500505510515520

-----

505510515520525

488493497502507

d1H1

Cd2

h

H

Wd

Ring dimensions Assembling dimensionsh = 65 h1 = 50 +/- 12h = 32 d2 max = C + 24W = 30 d1 min = C + 115

H1

h

H d1

d2

d

C

W

Frontseal®

36

Standard sizes

Frontseal® VE


VEVEVEVEVE

940950960970980

933944955966977

-----

944955966977988

900911921932942

VEVEVEVEVE

9901000102010401060

988999

101010251045

-----

9991010102510451065

953963973990

1008VEVEVEVEVE

10801100112011401160

10651085110511251145

-----

10851105112511451165

10271045106510841103

VEVEVEVEVE

11801200122012401260

11651185120512251245

-----

11851205122512451270

11211139115711761195

VEVEVEVEVE

12801300132513501375

12701295131513401365

-----

12951315134013651390

12181240125912811305

VEVEVEVEVE

14001425145014751500

13901415144014651490

-----

14151440146514901515

13281350137413971419

VEVEVEVEVE

15251550157516001650

15151540157016001640

-----

15401570160016401680

14431467149515241559

VEVEVEVEVE

17001750180018501900

16801720176518101855

-----

17201765181018551905

15961632167117141753

VEVE

19502000

19051955

--

19552010

17941844


VEVEVEVEVE

525530535540545

525530535540545

-----

530535540545550

512517521526531

VEVEVEVEVE

550555560565570

550555560565570

-----

555560565570575

536541546550555

VEVEVEVEVE

575580585590600

575580585590600

-----

580585590600610

560565570575582

VEVEVEVEVE

610620630640650

610620630640650

-----

620630640650660

592602612621631

VEVEVEVEVE

660670680690700

660670680690700

-----

670680690700710

640650660670680

VEVEVEVEVE

710720730740750

710720730740750

-----

720730740750758

689699709718728

VEVEVEVEVE

760770780790800

758766774783792

-----

766774783792801

735743751759768

VEVE

810820

801810

--

810821

777786

VEVEVEVEVE

830840850860870

821831841851861

-----

831841851861871

796805814824833

VEVEVEVEVE

880890900920930

871882892912922

-----

882892912922933

843853871880890


d1H1

Cd2

h

H

Wd

Ring dimensions Assembling dimensionsh = 65 h1 = 50 +/- 12h = 32 d2 max = C + 24W = 30 d1 min = C + 115

H1

h

H d1

d2

d

C

W

Frontseal®

37

Standard sizes

Frontseal® VAX



VAXVAXVAXVAXVAX

200205210215220

200205210215219

-----

205210215219224

192196200204207

VAXVAXVAXVAXVAX

225230235240250

224228232236240

-----

228232236240250

211215219223227

VAXVAXVAXVAXVAX

260270280290300

250260270281292

-----

260270281292303

236245255265275

VAXVAXVAXVAXVAX

310320330340350

303313325335345

-----

313325335345355

285295305315322

VAXVAXVAXVAXVAX

360380400425450

355372390415443

-----

372390415443480

328344360385410

VAXVAXVAXVAXVAX

500550600650700

480530580630665

-----

530580630665705

450495540600630


VAXVAXVAXVAXVAX

725750800850900

705745785830875

-----

745785830875920

670705745785825

VAXVAXVAXVAXVAX

9501000105011001150

920965

101510651115

-----

9651015106511151165

865910955

10001045

VAXVAXVAXVAXVAX

12001250130013501400

11651215127013201370

-----

12151270132013701420

10901135118012251270

VAXVAXVAXVAXVAX

14501500155016001650

14201470152015701620

-----

14701520157016201670

13151360140514501495

VAXVAXVAXVAXVAX

17001750180018501900

16701720177018201870

-----

17201770182018701920

15401585163016751720

VAXVAX

19502000

19201970

--

19702020

17651810

d1H1

Cd2

h

H

Wd

Ring dimensions Assembling dimensionsh = 31 h1 = 25 +/- 5h = 17,3 d2 max = C + 12W = 17,8 d1 min = C + 50 H1

h

H

d1

d2

d

C

W

39

Wiper seals

Description / Standard seal types 40

Production and Quality assurance / Installation and operation / Storage and handling 41

Standard sizes 42

Wiper seals

40

Description

Wiper rings are used to protect seals in sliding or reciprocating motions, preventing contamination from dirt particles (dust, mud, water, etc.).The lip of the wiper removes even the first dirt from the piston rod.Such dirt particles can cause damage to hydraulic or pneumatic systems during stroke movement. Even if they appear in good condition, wipers should always be replaced when changing seals.

Typical applications are:- earth moving machinery- lift trucks- hydraulic presses

Standard seal types

Current types

DAS with ground outer metal housing

DP6 without metal insert

DP7 with rubber covered metal insert

DP8 without metal insert, special profile

DRS with rubber covered metal insert

DWR without metal insert, inch sizes

Interchange table

Dichta types DAS DP6 DP7 DP8 DRS DWR

SIMRITPRÄDIFAMERKELGACOPOLYPAC

ASAM A5

P6 P7

ASOBA1P5

RSWRM

Wiper seals

41


Our wiper seals are manufactured according to internal Standards and quality assurance standards ISO 9001.

All production phases are checked and all measurements are recorded and stored for eventual tracing.


Groove design and tolerances

Temperature range and maximum speed

Temperature range of wiper seals is usually between –40° C and + 120° C and max. speed is 4 m/s. In most cases the material used is NBR. FPM is used for temperatures up to 200° C. This elastomer is also resistant against aggressive chemicals.


Some storage precautions must be taken in order to avoid deterioration of the material. Wiper seals should be stored in a dust free and dry atmosphere and they must be kept in their original wrapping which should only be opened just before installation. Samples should be repacked after inspection. Excessive humidity will deteriorate some elastomers as well as cause corrosive damage to metal casing.Do not drop wiper seals on shelves or boxes nor hang seals on hooks, wires or nails, since in either case the sealing lip can be damaged.Seals should be stored on a first in-first out basis to avoid ageing on the shelf. Avoid storage near sources of heat or near electrical equipment that may generate ozone. Also keep away from direct sunlight.

Tolerances

d D1 RBntD2

f7 - e9 + 0+ 0,2

+ 0+ 0,1

± 0,2 0,4 max

with metal insertDP7 DRS DAS

h8

without metal insertDP6 DP8 DWR

h11

D1

45°

0.5

t

d

RB

D1

n

t

d

R

D2

RB

RB

d

D1

D1

45°0.5

t

d

D

h

H

Wiper seals

42

Standard sizes

Wiper seals DAS

Road diameter mm

Wiper dimensions mm Bore dimensions mmD1d D h H t

DAS 6/13/3/4,5DAS 8/22/3/4,5DAS 10/16/3/4,5DAS 10/20/5/8DAS 12/20/4/6DAS 12/22/5/8DAS 14/22/3/4DAS 16/22/3/4DAS 16/26/5/8DAS 18/28/7/10DAS 20/28/3,5/5DAS 20/30/7/10DAS 22/28/5/9DAS 22/32/7/10DAS 25/35/7/10DAS 28/40/7/10DAS 30/40/5/8DAS 30/40/7/10DAS 32/45/7/10DAS 35/45/7/10DAS 36/45/7/10DAS 40/50/5/8DAS 40/50/7/10DAS 40/52/5/8DAS 42/52/7/10DAS 45/55/7/10DAS 45/60/7/10DAS 50/56/5/8

68

1010121214161618202022222528303032353640404042454550

68

1010121214161618202022222528303032353640404042454550

13221620202222222628283028323540404045454550505252556056

13221620202222222628283028323540404045454550505252556056

3 3 3 5 4 5 3 3 5 7 3,5 7 5 7 7 7 5 7 7 7 7 5 7 5 7 7 7 5

3 3 3 5 4 5 3 3 5 7 3,5 7 5 7 7 7 5 7 7 7 7 5 7 5 7 7 7 5

4,5 4,5 4,5 8 6 8 4 4 810 510 9101010 810101010 810 8101010 8

Reference

d

D1

D1

45°0.5

t

d

D

h

H

Wiper seals

43

Standard sizes

Wiper seals DAS

Road diameter mm


DAS 50/60/5/8DAS 50/60/7/10DAS 50/65/5/8DAS 50/65/7/10DAS 52/62/7/10DAS 55/65/7/10DAS 60/70/7/10DAS 63/75/7/10DAS 65/75/7/10DAS 70/80/7/10DAS 75/85/7/10DAS 80/90/7/10DAS 85/95/7/10DAS 90/100/7/10DAS 95/105/7/10DAS 100/110/7/10DAS 105/115/7/10DAS 110/120/7/10DAS 115/125/7/10DAS 120/130/7/10DAS 125/140/9/12DAS 130/145/9/12DAS 140/155/9/12DAS 170/185/10/14DAS 180/195/10/14DAS 200/220/12/16DAS 320/340/12/16

505050505255606365707580859095

100105110115120125130140170180200320

505050505255606365707580859095

100105110115120125130140170180200320

60606565626570757580859095

100105110115120125130140145155185195220340

60606565626570757580859095

100105110115120125130140145155185195220340

5 7 5 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 9 9 910101212

5 7 5 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 9 9 910101212

810 8101010101010101010101010101010101012121214141616

Reference

DAS wiper seals have a metal case and are installed in open grooves with interference

Wiper seals

44

d

D1

D2

d

D

h

H

D1

R

t

D2

Standard sizes

Wiper seals DP6

Road diameter mm

Wiper dimensions mm Bore dimensions mmd D1 D2 t RD h H

DP6 20/28/5/7DP6 22/30/5/7DP6 25/33/5/7DP6 28/36/5/7DP6 30/38/5/7DP6 32/40/5/7DP6 35/43/5/7DP6 36/44/5/7DP6 40/48/5/7DP6 42/50/5/7DP6 45/55/5/7DP6 50/58/5/7DP6 50/60/5/7DP6 55/65/5/7DP6 56/66/5/7DP6 60/70/5/7DP6 60/68/5/7DP6 63/73/5/7DP6 65/75/5/7DP6 70/80/5/7DP6 75/87/7/12DP6 80/92/7/12DP6 85/97/7/12DP6 90/102/7/12DP6 95/107/7/12DP6 100/112/7/12DP6 110/122/7/12DP6 115/127/7/12DP6 120/132/7/12DP6 125/140/10/16DP6 140/155/10/16DP6 150/165/10/16DP6 160/175/10/16DP6 180/200/10/18DP6 200/220/10/18DP6 240/260/10/18

20222528303235364042455050555660606365707580859095

100110115120125140150160180200240

20222528303235364042455050555660606365707580859095

100110115120125140150160180200240

28,6 30,6 33,6 36,6 38,6 40,6 43,6 44,6 48,6 50,6 55,6 58,6 60,6 65,6 66,6 70,6 68,6 73,6 75,6 80,6 87,2 92,2 97,2 102,2 107,2 112,2 122,2 127,2 132,2 140 155 165 175 200 220 260

2830333638404344485055586065667068737580879297

102107112122127132140155165175200220260

23 25 28 31 33 35 38 39 43 45 48 53 53 58 59 63 63 66 68 73 81 86 91 96 101 106 116 121 126 132,6 147,6 157,6 167,6 190 210 250

55555555555555555555777777777

10101010101010

5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 7,1 7,1 7,1 7,1 7,1 7,1 7,1 7,1 7,1 10,1 10,1 10,1 10,1 10,2 10,2 10,2

77777777777777777777

12121212121212121216161616181818

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1,5 1,5 1,5 1,5 3 3 3

Reference

DP6 wiper seals do not have any metal insert or case and are elastically installed in recessed grooves

Wiper seals

45

Standard sizes

Wiper seals DP7

Road diameter mm


DP7 8/14/3,5/5DP7 10/16/3,5/5DP7 12/18/3,5/5DP7 14/20/3,5/5DP7 15/21/3,5/5DP7 16/22/3,5/5DP7 16/24/3,5/5DP7 17/22/5/7DP7 18/28/5/7DP7 20/30/5/7DP7 22/32/5/7DP7 25/35/5/7DP7 28/38/5/7DP7 30/40/5/7DP7 32/42/5/7DP7 35/45/7/10DP7 36/46/5/7DP7 40/50/5/8DP7 42/52/5/7DP7 45/55/5/7DP7 50/56/5/7DP7 50/60/5/7DP7 55/65/5/7DP7 56/66/5/7DP7 60/70/5/7DP7 63/73/5/7DP7 65/75/5/7DP7 70/80/5/7DP7 75/83/7/10DP7 80/88/7/10DP7 90/100/5/7

8101214151616171820222528303235364042455050555660636570758090

8101214151616171820222528303235364042455050555660636570758090

141618202122242228303235384042454650525556606566707375808388

100

141618202122242228303235384042454650525556606566707375808388

100

3,53,53,53,53,53,53,5555555557555555555555775

3,53,53,53,53,53,53,5555555557555555555555775

555555577777777

10787777777777

10107

Reference

DP7 wiper seals have a metal insert and are installed in open grooves with interference

d

D1

D1

45°0.5

t

d

D

h

H

Wiper seals

46

Standard sizes

Wiper seals DP8

Road diameter mm


DP8 8/16/4/7DP8 10/18/4/7DP8 12/20/4/7DP8 14/22/4/7DP8 16/24/4/7DP8 18/26/4/7DP8 20/28/4/7DP8 22/30/4/7DP8 25/33/4/7DP8 28/36/4/7DP8 30/38/4/7DP8 32/40/4/7DP8 35/43/4/7DP8 36/44/4/7DP8 40/48/4/7DP8 42/50/4/7DP8 45/53/4/7DP8 48/56/4/7DP8 50/58/4/7DP8 55/63/4/7DP8 56/64/4/7DP8 60/68/4/7DP8 63/71/4/7DP8 65/73/4/7DP8 70/78/4/7DP8 80/88/4/7DP8 85/93/4/7DP8 90/98/4/7DP8 100/108/4/7DP8 110/122/5,5/10DP8 120/132/5,5/10DP8 125/137/5,5/10DP8 140/152/5,5/10DP8 160/172/5,5/10DP8 180/192/5,5/10DP8 200/212/5,5/10DP8 220/235/6,5/13DP8 250/265/6,5/13

8101214161820222528303235364042454850555660636570808590

100110120125140160180200220250

8101214161820222528303235364042454850555660636570808590

100110120125140160180200220250

16182022242628303336384043444850535658636468717378889398

108122132137152172192212235265

16182022242628303336384043444850535658636468717378889398

108122132137152172192212235265

14161820222426283134363841424648515456616266697176869196

106119129134149169189209231261

444444444444444444444444444445,55,55,55,55,55,55,56,56,5

4,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,154,155,655,655,655,655,655,655,656,656,65

77777777777777777777777777777

101010101010101313

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1,5 1,5 1,5 1,5 1,5 1,5 1,5 2 2

Reference

DP8 wiper seals do not have any metal insert or case and are installed with slight interference in recessed grooves, so that the wiper can be locked into position in both axial and radial directions

d

D1

D2

d

D

h

H

D1

R

t

D2

n

Wiper seals

47

Standard sizes

Wiper seals DRS

Road diameter mm


DRS 6/13/3/4,5DRS 10/20/5/8DRS 12/22/5/8DRS 15/25/5/8DRS 16/26/5/8DRS 18/28/5/8DRS 20/30/7/10DRS 22/32/7/10DRS 24/35/5/8DRS 25/35/7/10DRS 26/35/7/10DRS 28/40/7/10DRS 30/40/7/10DRS 32/45/7/10DRS 35/45/7/10DRS 36/45/7/10DRS 38/48/7/10DRS 40/50/7/10DRS 42/52/7/10DRS 45/55/7/10DRS 48/60/7/10DRS 50/60/7/10DRS 52/62/7/10DRS 55/65/7/10DRS 60/70/7/10DRS 65/75/7/10DRS 70/80/7/10DRS 75/85/7/10DRS 80/90/7/10DRS 85/95/7/10DRS 90/100/7/10DRS 95/105/7/10DRS 100/110/7/10DRS 105/115/7/10DRS 110/120/7/10DRS 115/125/7/10DRS 120/130/7/10DRS 125/140/9/12DRS 130/145/9/12DRS 140/155/9/12DRS 150/165/9/12DRS 160/175/9/12DRS 170/185/10/14DRS 180/195/10/14DRS 200/220/12/16DRS 220/240/12/16

610121516182022242526283032353638404245485052556065707580859095

100105110115120125130140150160170180200220

610121516182022242526283032353638404245485052556065707580859095

100105110115120125130140150160170180200220

132022252628303235353540404545454850525560606265707580859095

100105110115120125130140145155165175185195220240

132022252628303235353540404545454850525560606265707580859095

100105110115120125130140145155165175185195220240

355555775777777777777777777777777777799999

10101212

355555775777777777777777777777777777799999

10101212

4,5 8 8 8 8 8 10 10 8 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 12 12 12 12 12 14 14 16 16

Reference

DRS wiper seals have a metal insert and are installed in open grooves with interference

d

D1

D1

45°0.5

t

d

D

h

H

Wiper seals

48

Standard sizes

Wiper seals DWR

Road diameter mm


DWR 047070DWR 051074DWR 055082DWR 059082DWR 062087DWR 066094DWR 070094DWR 074110DWR 078110DWR 086118DWR 094125DWR 098129DWR 102133DWR 106137DWR 110141DWR 118149DWR 125157DWR 129161DWR 137169DWR 141173DWR 149181DWR 157188DWR 165196DWR 177208DWR 181212DWR 188220DWR 196228DWR 208240DWR 216248DWR 220251DWR 236267DWR 248279DWR 255287DWR 275307DWR 275322DWR 287318DWR 295326DWR 295345DWR 307362DWR 314346DWR 314362DWR 326358DWR 334366DWR 334381DWR 346393DWR 354401DWR 374421DWR 393440

1213141516171819202224252627283032333536384042454648505355566063657070737575788080838585889095

100

1213141516171819202224252627283032333536384042454648505355566063657070737575788080838585889095

100

18,6 19,6 21,6 21,6 22,6 23,6 24,6 28,6 28,6 30,6 32,6 33,6 34,6 35,6 36,6 38,6 40,6 41,6 43,6 44,6 46,6 48,6 50,6 53,6 54,6 56,6 58,6 61,6 63,6 64,6 68,6 71,6 73,6 78,6 82,2 81,6 83,6 87,2 92,2 88,6 92,2 91,6 93,6 97,2 100,2 102,2 107,2 112,2

1819212122232428283032333435363840414344464850535456586163646871737882818387928892919397

100102107112

15161818192021222325272829303133353638394143454849515356585963666873767678818583868688919496

101106

3,5 3,5 3,5 3,5 3,5 3,5 3,5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 7 5 5 7 7 5 7 5 5 7 7 7 7 7

3,8 3,8 3,8 3,8 3,8 3,8 3,8 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 5,3 7,1 5,3 5,3 7,1 7,1 5,3 7,1 5,3 5,3 7,1 7,1 7,1 7,1 7,1

5555555777777777777777777777777777

1277

12127

1277

1212121212

111111111111111111111111111111111111111111111111

Reference

DWR wiper seals do not have any metal insert or case and are elastically installed in recessed grooves

d

D1

D2

d

D

h

H

D1

R

t

D2

49

Special Parts

Lip seals 50

Polyurethane hydraulic seals 51

Springs / Bonded seals 52

Hydraulic seals for high pressure 53

Hydraulic seals for medium high pressure 54

O-Rings / Incofep 55

Vibration dampers 56

Special parts

50

Lip seals

Symmetrical and non symmetrical rubber lip seals for reciprocating movements.

U/UM UM are the strongest kind of moulded lip seals with a hardness of 90 ShA. They can be assembled both on pistons and cylinders and withstand pressure up to 120 bar/cm2. U seals are the same as UM, but their sizes are in inches.

M Same structure as the UM type, but different in sizes and in the negative cut of the lips. They are produced in 85 ShA.

DE/DEM They are produced with a hardness of 75 ShA for easier assembling. These seals are made for dynamic external sealing on only one lip. They withstand a pressure of up to 80 bar/cm2. DE seals are used on pistons with inch dimensions and have lips with sharp cut edges; DEM seals are used on pistons with metric dimensions and have lips with tapered negative cut.

DI/DIM They are produced with a hardness of 90 ShA and made for dynamic internal sealing on only one lip. The external lip is higher and stronger than the internal one and they are suitable for operating pressure up to 120 bar/cm2.DI seals are used on rods with inch dimensions and have lips with sharp cut edges; DIM seals are used on rods with metric dimensions and have lips with tapered negative cut.

H They are made with a hardness of 90 ShA and withstand a working pressure of 40 bar/cm2. They are used on cylinders as oil control rings or dust covers and must be axially pressed in the seat with a ring.

C They are made with a hardness of 90 ShA and withstand a working pressure not exceeding 40 bar/cm2. They are known as caps and are installed on pistons as rod wipers.

Special rubber hardness or different elastomers available on request.

Special parts

51

Polyurethane hydraulic seals

DKD The piston seal type DKD assures a good reaction against shock pressure peaks and low friction in the low pressure range. The asymmetric lips are designed to differentiate the behavior of the lips on the static and dynamic surfaces: the static lip is flexible, more sensitive to pressure fluctuations and it guarantees a wide contact area; the dynamic lip is shorter and stronger to concentrate load against the dynamic surface. They can also be used in back-to-back arrangement for double acting piston. Pressure up to 400 bar.

DSD Wear and dry run are largely prevented by additional lubricant retained within the gap created by the secondary lip. In some cases this second sealing lip may even acts as a substitute for a costly tandem sealing system when complete sealing under certain working conditions can only been achieved by two seals placed one behind the other in separate housing. Pressure up to 400 bar.

DKGD The piston seal DKGD has a sealing rubber element with low permanent deformation that assures good sealing performance, two anti-extrusions rings with stabilizers to avoid the rotation of the rubber element, two angular wear rings which guide the piston in the cylinder and support radial loads. Pressure up to 400 bar.

DUP The seal type DUP is a high performance all purpose lip seal suitable for both rod and piston. The DUP profile assures a good reaction against shock pressure peaks and low friction in all conditions. Pressure up to 400 bar.

DSA The function of the DSA wiper ring is to prevent introduction of dust, dirt and foreign matter into the system. This is achieved by a special wiper lip which produces a very effective cleaning action, prevents the development of scores, protects the guiding parts and extends the service life of the axial moving rod seals. An external sealing lip on the outside diameter contacts the housing in order to prevent moisture entering the groove. The internal ribs give stability and prevent twisting and sticking of the wiper in the groove.

Special parts

52

Springs

Bonded seals

All our FPM oil shaft seals are supplied with stainless steel springs AISI 302/304, whereas the NBR seals are fitted with carbon steel springs. In our stock we have a wide range of stainless steel springs AISI 302 that, on customers’ request, can either be fitted on the NBR seals or can be dispatched singularly for customers’ service.

For special applications we can also supply stainless steel sprigs AISI 316; a more limited range of dimensions is available in our stock for immediate delivery.

Bonded seals are static seals used as sealing rings threaded fittings and flange connections. To avoid any damage on the sealing lip, the inside diameter of bonded seal should be larger than the external thread diameter and the rubber should be bonded to the inside metal only.

d

d1

D

M

G R

S

P

Special parts

53

Hydraulic seals for high pressure

TO - TG Packing sealsTO and TG packing seals are composed of lip rings made of cotton fabric reinforced elastomer. TO and TG packing seals are suitable for reciprocating movements and can be fitted on rods as well as on pistons. They are available in a variety that covers all applications from light duty to the heaviest working conditions.

TO SeriesPressure: up to 40 MPaSpeed: up to 0,5 m/sTemperature: up to 200°C depending on the elastomer

TG SeriesPressure: up to 40 MPaSpeed: up to 0,5 m/sTemperature: up to 200°C depending on the elastomer

ENERGISING RING: cotton fabric reinforced rubber; its function is to ensure a uniform pre-load to the seal.

ENERGISING RING: special compound with resins to obtain a great resistance.

INTERMEDIATE RING: cotton fabric reinforced rubber; the sealing ring.

INTERMEDIATE RING: rubber; for application with low pressure and continuous vibrations.

SUPPORT RING: cotton fabric reinforced rubber; its function is to support the entire series, it also has an optimal extrusion resistance.

Type TO 3 TO 5 TO 6 TO 7 TO 7/1

COMPOSITION

ENERGISING RING 1 1 1 1 1 1

FABRIC RUBBER INTERMEDIATE RING 1 2 3 3 4 5

RUBBER INTERMEDIATE RINGS - 1 1 2 1 -

SUPPORT RING 1 1 1 1 1 1

Type TG 5 TG 6 TG 7

COMPOSITION

ENERGISING RING 1 1 1

FABRIC RUBBER INTERMEDIATE RINGS 3 4 5

SUPPORT RING 1 1 1

TO 7/0

Special parts

54

Hydraulic seals for medium high pressure

TEOL Packing seals

TEOL 1 (S8) Rod seal manufactured as an integral element, vulcanising a NBR sealing element on a reinforced cotton fabric base. Compact seal, even for standard housings according to ISO 5597.

Pressure: up to 20 MPaSpeed: up to 0,5 m/s

TEOL 1A (S24) Similar to TEOL/1 with an anti extrusion synthetic resin ring.


TEOL 2 (G10) Rod seal manufactured as an integral element by vulcanising together cotton fabric and NBR. Excellent resistance to wear and low friction.


TEOL 8 (G18) Two parts rod seal: lip sealing part in fabric reinforced rubber and support part moulded in a special rigid fabric. Suitable in cases where hydraulic equipment is subjected to severe vibrations, shock and high pressure.


TEOL 1/B Rod seal manufactured as an integral element by vulcanising together cotton fabric and NBR.


Special parts

55

O-Rings

We can produce from mould all the standard metric and inch O-rings sizes in different compounds, such as NBR 70° ShA and FPM 75° ShA. Other compounds and/or hardness are available on request.

Hot vulcanized O-rings

We can produce spliced O-rings on request with our hot vulcanization technology. With this procedure the O-ring is endless and without any evidence of splice: endurance and elasticity are very similar to those of moulded O-rings.

Encapsulated O-rings

Encapsulated O-rings are O-rings consisting of a seamless and uniform Teflon® FEP/PFA encapsulation/jacket which completely encloses a core material of either Silicone or FPM elastomers. The encapsulated O-ring behaves like a highly viscous fluid, any pressure exerted on the seal is trasmitted pratically undiminished in all directions.

d1 = cord diameterd2 = inner diameterd3 = medium diameterd4 = outer diameter

Upon request we can vulcanize any rubber extruded profile.

Although this technology avoids the majority of joint O-rings problems, it is important to take some cautions when handling vulcanized O-rings, and specifically :

no excessive traction on splice

bending radius on splice not bigger than ¼ of cord diameter

d1

d2

d3

d4

torsion

splice

splice

traction

Special parts

56

Vibration dampers

ST SERIES

CM & CF SERIES

SS SERIES

The vibration dampers are extremely well suitable for making elastic contact.They are widely used in industrial and agricultural application, especially in flexible suspension, and for vibration absorption of machines and several mechanic structures. These vibration dampers are produced from molded rubber between two parallel metal sheets. Screw, screw-nut or their combination is placed on its two sides.

ST-1 M/M

ST-2 M/F

ST-3 F/F

ST-4 M

ST-5 F

SS-1

SS-2

SS-3

CM

CF

57

Compounds

Compounds

58

Elestromeric Sealing Materials

NITRILE RUBBER (NBR)

This elastomer is a copolymer of butadiene and acrylonitrile and is used for the majority of conventional fluid sealing applications.

• Working temperature range: about -30°C to +100°C (+120°C maximum)• Standard colour: black

Advantages:• Good swelling resistance in mineral oils and greases• Good swelling resistance in water and radiator fluid

Limitations:• Poor resistance to high-alloyed hypoid oil• Poor resistance to ozone, weathering and sunlight• Not resistant to automotive brake fluid (glycol ether based)• Poor resistance to polar fluids (ketones, ethers, esters)• Poor resistance to chlorinated hydrocarbons (carbon tetrachloride, trichlorethylene)• Poor resistance to aromatic hydro-carbons

FLUORO ELASTOMER (FPM)

Mostly known under the trade names VITON® from Du Pont, TECNOFLON® from Solvay and FLUOREL® from 3M. It has good chemical resistance and is recommended for high temperature applications.

• Working temperature range: -20°C to + 200°C• Standard colour: brown

Advantages:• Excellent resistance to mineral oils, greases (also with the majority of additives) and above all high-alloyed hypoid oils• Excellent acid resistance• Good resistance to aromatic and chlorinated hydrocarbons• Excellent resistance to ageing, ozone and weathering

Limitations:• Limited cold flexibility• Poor resistance to polar fluids (ketones, ethers, esters)

SILICONE RUBBER (SIL)

Also referred to as MVQ or VMQ• Working temperature range: -50°C to + 200°C• Standard colour: red / orange

Advantages:• Retains flexibility down to very low temperatures• Withstands continuous heating at high temperatures without hardening• Resistant to mineral oils and greases• Excellent resistance to ageing, weathering and ozone

Limitations:• Not recommended for use with aliphate as well as aromatic hydrocarbons such as petrols and paraffin, and lighter mineral oils or steam over 3.5 bar• Not resistant to hot water (100°C), acids and non-mineral automotive brake fluids• Poor tensile and tear strength• Poor wear resistance

Compounds

59

HYDROGENATED NITRILE BUTADIENE RUBBER (HNBR)

• Working temperature range: -30°C to +150°C• Standard colour: black

Advantages:• High resistance to oils and greases• Good resistance to mineral and hydraulic oils• Good resistance to acids and bases diluted• Excellent resistance to ageing, ozone and weathering

Limitations:• Poor resistance to acids and bases concentrated• Poor resistance to aromatic and polar solvents

CHLOROBUTADIENE RUBBER (CR)

• Working temperature range: -40°C to + 100°C• Standard colour: black

Advantages:• Excellent resistance to ageing, weathering and ozone• Moderate resistance to mineral oils and greases

Limitations:• Tends to harden or stiffen at low temperatures• Not resistance to non-mineral automotive brake fluids

ACRYLATE RUBBER (ACM)


Advantages:• Good resistance to oils and fuels• Good resistance to ozone and weathering

Limitations:• Not resistant to water, water solutions and steam• Poor resistance to polar fluids (ketones, ethers, esters)• Poor resistance to chlorinated hydrocarbons (carbon tetrachloride, trichloroethylene)• Poor resistance to aromatic hydrocarbons• Limited cold flexibility• Poor wear resistance

ETHYLENE PROPILENE DIENE RUBBER (EPDM)


Advantages:• Excellent resistance to ageing, weathering and ozone• Good resistance to water and steam• Good resistance to automotive brake fluid (glycol ether based)• Good resistance to polar fluids

Limitations:• Poor resistance to mineral oils and greases

Temperature values are maximum values and therefore approximate, since they may vary depending on the different operating parameters. For more detailed information please contact our technical department.

60

DISCLAIMERAll technical information published on this brochure are for general reference only and cannot be considered to be binding. DICHTA SA will not be held liable for any claim or damage arising from the malfunction or the wrong utilization of our products, or from the misinterpretation of this brochure. Please contact our technical department for all information on precise operating conditions of our products. Changes on this brochure cannot be communicated and will appear in the next release. DICHTA SA cannot be held responsible for any typing error appearing on the brochure.

COPYRIGHTFRONTSEAL® RADIASEAL® SPLITRING® are Trademarks of Dichta SA, Switzerland, Register Nr. 361481 / 360372 / 361482 EBGE, Bern, Switzerland and at WIPO World Intellectual Property Organization in Geneva, Switzerland, according the Madrid Protocol. Copyright by Dichta SA, Switzerland. Version 3 / February 2012

DICHTA SAVia Sottobisio 28Balerna - P.O. Box 219CH-6830 CHIASSO 3

SWITZERLAND

P +41 91 683 85 02F +41 91 683 00 50

[email protected]

www.dichta.com

HEAVY INDUSTRY SEALING TECHNOLOGY

Cover dichta.indd 1 20/03/12 10.41

61

WIND POWER SEALING SOLUTION

Dichta can affirm having been among the pioneers in the wind power sealing products’ field.In the beginning by developing specific compounds resistant to adverse atmospheric conditions, increasing the range of sizes which today reach 2500 mm endless, then by raising all safety and quality aspects in the manufacturing process that are of central importance to this sensitive and critical application. Today we can serve our customers with a global and reliable solution, supported by experience, references, know-how, and a long list of added values that distinguish our company.

Spring 2013


To satisfy the growing request from the market, Dichta has decided to complete its product line for rotary movement with a wide range of products for hydraulic cylinders like wipers, rod seals, guide strips and piston seals. For our customers in the heavy industry whom we already serve with items for the rotary movement, we have become a one-stop-shop with obvious logistic and economical advantages. All new customers are invited to test our commitment for quality, reliability and speed which has distinguished us throughout the past 30 years.

Autumn 2011

DICHTA SAVia Sottobisio 28Balerna - P.O. Box 219CH-6830 CHIASSO 3

SWITZERLAND

P +41 91 683 85 02F +41 91 683 00 50

[email protected]

www.dichta.com


Cover dichta.indd 1 20/03/12 10.41

WIND POWER SEALING SOLUTION

Documents

Dichta Catalogue